Wireless Access

Frequent Contributor II

Question regarding 20Mhz & 40Mhz

Hi All,

We have 40Mhz enabled on 5Ghz on 3rd Floor and 20Mhz enabled on 2nd Floor. Previously 2nd Floor also was on 40Mhz but due to more number of APs we have disabled 40MHz there.

The 3rd floor AP signal strength is 12-18 dBm and can be heard in 2nd Floor as well.

So my question is, will it make any disconnection to the wireless clients who are connecting in 2nd Floor ?

Is it bad to mix up 20Mhz & 40Mhz on 5Ghz for same SSID ?

Guru Elite

Re: Question regarding 20Mhz & 40Mhz

You should just run all 20 mhz channels. By default 40 mhz only allows 4 non-overlapping channels, and 20mhz allows 9, so that provides an advantage. Some clients also use channel width for roaming, so you could have clients holding on too long and causing disconnects if you mix channel widths.

*Answers and views expressed by me on this forum are my own and not necessarily the position of Aruba Networks or Hewlett Packard Enterprise.*
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Frequent Contributor I

Re: Question regarding 20Mhz & 40Mhz

The rules for checking a secondary channel is free to use are different to a primary channel. You will end up with the primary channel of some second floor APs being a secondary channel of your third floor. It's likely the second floor clients will suffer from their channel being stepped on by the channel bonding.

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